Section 117F. The commissioner, in person or by deputy, shall have free access at all reasonable hours to any building or other place wherein it is reasonably believed that farm products marked, branded or labelled in accordance with official grades or standards established and promulgated by the commissioner are being marketed or held for commercial purposes. He shall also have power in person or by deputy to open any bags, crates, or other containers containing said farm products and examine the contents thereof, and may, upon tendering the market price, take samples therefrom.